Kinetic Modeling of Selective Oxidation of H2S on Fe2O3/Cr2O3/Al2O3

Claus process is used for sulfur recovery in oil and natural gas refineries. SuperClaus process can increase the sulfur recovery and reduce the environmental problem of the Claus process by adding selective oxidation reaction. This reaction was developed base on different catalyst experimentally. But kinetic model and rate of the reactions have not been developed yet that are necessary for simulation the process. In this article, a reaction network including main and side reactions was developed. Reaction constants and activation energies of this model were fitted using nonlinear optimization on set of ordinary equations of plug flow reactor. The results show good agreement between H2S conversion and sulfur selectivity according to different temperatures. The coefficient of determination, R2, of nonlinear regression for the conversion and selectivity are 0.989 and 0.975, respectively.

Keywords:

Super Claus , Kinetic Modeling , Selective Oxidation , H2S.